/**
 * @template T
 * @template {T} S
 * @param {T[]} items
 * @param {(node: T) => node is S} predicate
 * @returns {S | undefined}
 */
export function find<T, S extends T>(items: T[], predicate: (node: T) => node is S): S | undefined;
/**
 * @template T
 * @template {T} S
 * @param {T[]} items
 * @param {(node: T) => node is S} predicate
 * @returns {S[]}
 */
export function filter<T, S extends T>(items: T[], predicate: (node: T) => node is S): S[];
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